Cover for conduit-outlet boxes



Aug. 21, 1928. 1,681,594

J. T. PEARSON ET AL COVER FOR CONDUIT OUTLET BOXES Filed April 15, 1925m INVENTOR5. w

A TTORNEY-S Patented Aug. 21, 1928.

UNITED STATES- PATENTOFFICE.

JOHN '1. PEARSON AND RAYMOND H. OLLEY, OF SYRACUSE, NEW YORK, ASSIGNORSTO CROUSE-HINDS COMPANY, YORK.

0F SYRACUSE, NEW YORK, A OORIPORATION OF NEW COVER FOR CONDU'IT-OUTLET'BOXES.

- ap ucanon filed April 15, 1925. Serial No. 23,333.

This invention relates to covers for conduit outlet boxes of thetype setforth in our Patent, Number 1,525,689, issued Feb. 10, 1925, and has forits object a particuof a cover, and simple assembly ofthe wedging memberor nut, of the self-contained fastoning means for the cover.

The invention'consists in the novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanyingdrawings in which like characters designate corresponding parts in allthe views.

Figure 1 is a. face view of a conduit outlet box, provided with thiscover, the cover being partly broken away.

Figure 2 is atransverse sectional View on line 2-2, Fig. 1.

Figure 3 is a longitudinal sectional view on line 33, Fig. 1.

Figure 4 is an inner face view of the cover.

1 designates a conduit outlet box having an opening in one side, andmeans as one or more nipples 2 for connection in the conduit systemenclosing the wires passing through openings in the cover, the wallsconfining the opening being fiat or free from obstructions projectinginto the body, as lugs for receiving fastening screws for the cover.

The conduit outlet boxes are usually elongated and the opening in oneside thereof is elongated or oblong and narrow, and the cover conformsto the narrow opening in the box. l

The cover includes a body 3, and a plate 4 secured to the inner face ofthe body 3, the outer edge of the plate 4 being spaced-apart from theedge of the body 3 leaving aimarginal bearing face 5 around the platefor resting upon the edge of the wall around the opening of the box, oron a gasket 6 interposed between the marginal bearing face 5 and theedge of the wall around the opening in the box. The plate is secured atits ends 1 to the inner face of the box in any suitable manner as byspot-welding and the lntermediate part of the plate is offset orspacedapart from the inner face of the box.

The body 3 and the plate 4' are usually of comparatively light sheetmetal and in order to give rigidity to the cover, the offset part of theplate is formed with one or more transverse corrugations 8, the apex ofwhich preferably bears against the inner face of the body 3, and may ifdesired be secured thereto as by spot-welding.v As here illustrated theintermediate part of the plate 4 is formed 5 larly simple, light andstrong construction with a single transverse corrugation.

The self-contained means for securing the cover to the box ispractically the same in general, in so far, as this invention isconcerned, as that of our Patent No.1,525,689, and comprises a wedge ornut 9 movable laterally while'being clamped toward the cover, into snugengagement with the inner face of one wall of the box, such lateralmovement tending to thrust the cover laterally in the oppositedirection, and thrust one or more shoulders 10 on the opposite edge ofthe plate 4 to that on which the nut or wedge 9 is located intoengagement with the opposite wall of the box, the wedge being operableby a screw 11 extending through the body 3 of the cover and threadinginto the nut, The nut and the plate are provided with coacting surfaceswhich tend to thrust the nut laterally when the screw 11 is beingtightened, and to permit the nut to move inwardly or release its grip onthe box when the screw is loosened.

' In our present invention the nut extends into a transverse notch orslot 12 formed in the intermediate part 7 of the plate 4, this slotbeing alined with the inner end of the corrugation formingthe bottom orthe inner end wall of the slot; and the end of the corrugation whichforms the bottom of the notch is bevelled, inclined plane fashion as at13, and coacts witha correspondingly bevelled face 114 on the inner sideof the nut. The end portions of the plate are formed with leng hwisetapering corrugations 15, for receiving inwardly extending lugs 16 onthe gsket 6 and holding the gasket from dis pl cement. These lugs alsoserve to prevent the workman from fastening the cover \unlcss it isplaced'squarely on the box. The corrugations 15, form no part of thisinvention.

Owing to the corrugation 8 and the relative arrangement of the nut orwedge 9 the cover is particularly light and at the same time strong andrigid and provision made in a particularly simple manner for the wedgingaction of the nut. What we claim is: VI A cover for conduit outletboxes, comprising a body, a plate secured to the inner side ofrthe bocy,edge of the b0 face on the ho y corrugation, the plate beingformed witha slot therein opening through one edgeihere of, the =corrugation' beingahned' with" the slot, and one end of. the corrugation forming;

the inner'end wall of-the slot, andzfzistening means forattachmg a'coverto H-COlldllltOlItf let box, compmsing a Wedge member extende ingv intothe slot, the Wedge member :and-zithe endofitliecorrugation hein'giormedwith coactin 'surfeces act-ingito thrn stethe wedgemem er-latemlly uponclam mgi movement.

of the; wedge memberitowarc "theinnerface of theeover, and means--fo1vclamping the wedge member.

Inetestimony whereof," we have hereunto signed our" names,-atvisyracuse,einlthe county of Onondaga andpState of New York, this6th. day-ofiApril, 1925;

JOHN; QPEA'RSO'N; RAYMQNDTH. oLLEY.

